I think maybe is not need for the backend to wait for response. There is another way.vhost-user send "VHOST_GET_MEM_TABLE" to qemu then qemu send VHOST_SET_MEM_TABLE to update the regions of vhost-user.same as other command. If qemu could response the request of the vhost-user.the vhost-user could update date at anytime.
I think it's very useful for Commercialization. On 2014/9/17 16:38, Michael S. Tsirkin wrote: > Reply-To: > > Thinking about the vhost-user protocol, VHOST_SET_MEM_TABLE > is used to update the memory mappings. > > So shouldn't we want for response? > Otherwise e.g. guest can start using the memory > that vhost-user can't access. > > Similarly, with an IOMMU vhost-user might access memory it shouldn't. > > VHOST_SET_VRING_CALL is used for MSI-X masking. > Again, after vector is masted by switching the call fd, > backend shouldn't assert the old one. > > Thoughts? > >
